Real Gas Model for an Electric Swashplate Refrigeration Compressor

Real Gas Model for an Electric Swashplate Refrigeration Compressor Author links open overlay panelMohammadArqam1Dzung VietDao1AmirJahangiri2MarkMitchell2PeterWoodfield1 1 School of Engineering and Built Environment, Griffith University, Australia 2 Unicla International Ltd., Ormeau, QLD, Australia Highlights-(JIJR-D-19-00930) • A real-gas, restricted-flow valve model is developed for the swashplate compressor • The model agrees well with experimental data for R134a and R1234yf • In-cylinder heat transfer was found to be of lesser importance • Pressure drop across the discharge valve was found to be of lesser importance • Suction valve flow coefficient has a significant effect on volumetric efficiency Abstract A real-gas, restricted-flow valve model is compared with an ideal-gas, ideal-valve model for a 10-cylinder swashplate refrigeration compressor. Real gas properties of R134a are evaluated using the NIST standard reference database. A minor-loss discharge-coefficient approach is used to model the refrigerant flow rate through reed valves while the ideal-valve model requires no pressure difference to open the valve. In contrast with the ideal model, the discharge temperature, refrigerant mass flow rate and volumetric efficiency as a function of rotational speed are predicted well by including real-gas properties and flow restriction on the inlet valve. The ideal-gas model significantly overpredicts the discharge temperature and shows no dependence on rpm. Heat transfer to and from the cylinder wall during compression and expansion is found to have only a small effect on predictions of compressor performance. The valve model for the suction side has the largest influence on compressor performance predictions as a function of rpm.

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